Abstract: A sealed beverage package including a container with a beverage and an insert sealed therein. The insert holds a gas that upon opening the container interacts with the beverage to produce a froth in the beverage. The insert is designed to float in the beverage and is sized relative to the container such that it cannot rotate end-over-end therein. The insert includes a body with at least one fin extending therefrom. The at least one fin may have the dual functions of securing the insert in the container above the beverage to facilitate charging the insert with gas, as well as preventing the insert from exiting the container, once the container is opened.